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From 7197c8b9234f26922ce7c6f3d7784b2604bdaafd Mon Sep 17 00:00:00 2001
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From: Alex Williamson <alex.williamson@redhat.com>
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Date: Thu, 21 Nov 2013 21:08:58 +0100
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Subject: [PATCH 10/14] vfio-pci: Fix multifunction=on
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RH-Author: Alex Williamson <alex.williamson@redhat.com>
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Message-id: <20131121210817.12705.22782.stgit@bling.home>
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Patchwork-id: 55844
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O-Subject: [RHEL7 qemu-kvm PATCH] vfio-pci: Fix multifunction=on
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Bugzilla: 1029275
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RH-Acked-by: Amos Kong <akong@redhat.com>
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RH-Acked-by: Paolo Bonzini <pbonzini@redhat.com>
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RH-Acked-by: Bandan Das <bsd@redhat.com>
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Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1029275
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Brew: https://brewweb.devel.redhat.com/taskinfo?taskID=6627360
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Upstream: 187d62327aca39afbb038d13d7cd6bf2d11640d3
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When an assigned device is initialized it copies the device config
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space into the emulated config space. Unfortunately multifunction is
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setup prior to the device initfn and gets clobbered. We need to
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restore it just like pci-assign does.
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Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
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Reviewed-by: Bandan Das <bsd@redhat.com>
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Message-id: 20131112185059.7262.33780.stgit@bling.home
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Cc: qemu-stable@nongnu.org
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Signed-off-by: Anthony Liguori <aliguori@amazon.com>
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---
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hw/misc/vfio.c | 7 +++++++
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1 file changed, 7 insertions(+)
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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hw/misc/vfio.c | 7 +++++++
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1 files changed, 7 insertions(+), 0 deletions(-)
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diff --git a/hw/misc/vfio.c b/hw/misc/vfio.c
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index b7f213b..5a6925c 100644
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--- a/hw/misc/vfio.c
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+++ b/hw/misc/vfio.c
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@@ -3625,6 +3625,13 @@ static int vfio_initfn(PCIDevice *pdev)
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vdev->emulated_config_bits[PCI_HEADER_TYPE] =
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PCI_HEADER_TYPE_MULTI_FUNCTION;
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+ /* Restore or clear multifunction, this is always controlled by QEMU */
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+ if (vdev->pdev.cap_present & QEMU_PCI_CAP_MULTIFUNCTION) {
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+ vdev->pdev.config[PCI_HEADER_TYPE] |= PCI_HEADER_TYPE_MULTI_FUNCTION;
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+ } else {
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+ vdev->pdev.config[PCI_HEADER_TYPE] &= ~PCI_HEADER_TYPE_MULTI_FUNCTION;
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+ }
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+
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/*
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* Clear host resource mapping info. If we choose not to register a
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* BAR, such as might be the case with the option ROM, we can get
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--
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1.7.1
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